William potter



(No Model.) 7

W. POTTER. MORTISING CHISEL.

N0. 597,020. Patented Jan. 11,1898.

fN VE/VTOR on the line 5 of Fig. 2.

UNITED STATES ATENT rricn.

\VILLIAM POTTER, OF NEiV YORK, N. Y.

MORTISlNG-CHISEL.

SPECIFICATION forming part of Letters Patent No. 597,020, dated January 11, 1898.

Apolication filed Aprillfi, 1897. derial No. 632,222. No model.)

To all whom, zit may concern:

Be it known that I, WILLIAM POTTER, of New York city, in the county and State of New York,have invented a new and Improved Mortising-Ohisel, of which the following is a full, clear, and exact description.

The object of my invention is to construct a inortising-chisel in such a manner that the chips, whet-her large or small, will have a free and ready passage from the cutting edge to the discharge-point, a predetermined distance from said edge.

Another object of the invention is to provide a means whereby the chips will be confined to the chisel for a certain distance from the cutting-point, yet be free to move rearward to their point of exit.

A further object of the invention is to so construct the chip-receiving channel of the chisel that the chips cannot slide forward and impede the backward movement of the chips as they are newly made by the cutting edge of the tool.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all-the figures.

Figure .l. is a perspective view of the chisel. Fig.2 is a longitudin al vertical section through the chisel. Fig. 3 is a plan view of the chisel. Fig. 4: is a front elevation. Fig. 5 is a section Fig. 6 is a section on the line 6 6 of Fig. 2, and Fig. 7 is a longitudinal vertical section through a chisel slightly modified in its construction.

The body A of the chisel is provided with a longitudinally-tapering floor 10, constitut ing the bottom of the chip-receiving channel B. The floor 10 is of equal width throughout its length, and its forward end 11 is inclined or beveled, terminating at the plane of the under face of the chisel in a comparatively sharp edge 12. The rear end wall 13 of the channel B is upwardly curved, and the floor 10 is given a gentle upward slope from the cut ting edge of the chisel rearward, as shown in Figs. 2 and 7. The side walls 14 of the chisel may be given any desired exterior shape and are preferably eXteriorly straight, while interiorly the side walls of the chisel are beveled or inclined in opposite directions from the floor 10, as shown at 15 in the drawings.

At the cutting-point of the chisel the side walls 14 are curved inward over the floor to a predetermined extent, forming thereby flanges 16. These flanges extend a predetermined distance rearward and then lose themselves in the side walls. The flanges serve to prevent the chips from being forced out of the channel at the cutting-point of the chisel, yet the flaring walls of the chip-receiving channel 13 will admit of the chips moving freely rearward until they are clear of the flanges 16, whereupon they find a ready exit from said channel. The front end portions 17 of the chisel are beveled in the ordinary manner and constitute the cutting edges, together with the edge 12 at the forward end of the floor 10; but the beveled cutting edges project beyond the aforesaid edge 12 of the floor, as is shown in the drawings.

In the bottom wall 10 of the chip-receiving channel 13 it may be desirable, as shown in Fig. 7, to produce a series of teeth 18, rearwardly inclined. These teeth will engage the chips near the cutting edge and hold them in the channel until the next stroke, and the tendency of all the chips cut will be to move rearward and find an exit from the chisel.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A mortisingchisel provided with a chipreceiving channel whose side walls have their inner faces inclined upwardly in one plane and in opposite directions and at their upper edges are turned toward each other to form flanges, which flanges are largest at the cutting or forward end of the tool, taper rearwardly from said end and merge into said side walls near the rear of said chip-receiving channel, as and for the purpose set forth.

2. A mortising-chisel provided with a chipreceiving channel having a floor bounded on each side by a wall whose inner face is inclined in one plane upwardly and outwardly, but turned inwardly at its upper edge, the flange formed by said upper edge increasing from the rear forwardly, and being abruptly terminated at the forward end of the tool, at

which point the said side walls are beveled to form the cutting edge of the tool, as and for the purpose set forth.

3. A lnortising-chisel provided with a chip receiving channel having a longitudinallytapering floor 10, said floor being beveled at its forward end and terminating at the plane of the under face of the chisel to form the edge 12, the side walls of said channel having their inner faces inclined upwardly in opposite directions and having their upper edges turned toward each other and forming flanges which increase from the rear forward- 1y, whereby the side walls taper parallel with the floor 10, the said side walls having their 7 flanges abruptly terminating above the beveled end of the floor and being beveled beyond said flanges to form cutting edges 17, as and for the purpose set forth.

4:. A in ortisingchisel provided with a chipreceiving channel whose floor is convexed at its forward or cutting end and conoaved at its rear end to meet the upper edge of the shank, said floor being of uniform Width and being given a gradual incline between the two ends, the side walls of said channel having their inner faces inclined upwardly in opposite directions and their forward ends beveled beyond the convexed end of the floor to form cutting edges, the walls being inclined inwardly at their upper edges in the rear of said beveled portion to form flanges which taper rearwardly and merge into said side walls at the point where the floor is concaved, as and for the purpose set forth.

WILLIAM POTTER.

Vv itnesses:

F. W. HANAFORD, JNo. M. BITTER. 

